1387979899 has 4 divisors (see below), whose sum is σ = 1401455536. Its totient is φ = 1374504264.

The previous prime is 1387979893. The next prime is 1387979911. The reversal of 1387979899 is 9989797831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1387979899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387979893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6737664 + ... + 6737869.

It is an arithmetic number, because the mean of its divisors is an integer number (350363884).

Almost surely, 2^1387979899 is an apocalyptic number.

1387979899 is a deficient number, since it is larger than the sum of its proper divisors (13475637).

1387979899 is a wasteful number, since it uses less digits than its factorization.

1387979899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13475636.

The product of its digits is 61725888, while the sum is 70.

The square root of 1387979899 is about 37255.6022498630. The cubic root of 1387979899 is about 1115.4781272376.

The spelling of 1387979899 in words is "one billion, three hundred eighty-seven million, nine hundred seventy-nine thousand, eight hundred ninety-nine".